Sync folder outside Dropbox

I utilize Dropbox to share completed photos to friends and clients. But the way how my photo editing process works it requires having a folder outside Dropbox. So instead of having two copies of same photos in different locations… I utilize Windows built-in mklink command to create a junction link.

My workflow requires folder C:\pictures\completed but I also want that folder in Dropbox as well.

That creates a junction link between the two. I am not too familiar what a Windows junction link is but it sounds a lot like hard link in *nix. If anyone knows the details please feel free to educate me!